How to specify multiple restrict frame ranges for the F-curve Noise modifier?
One way to let the F-Curve modifier affect the animation in several frame ranges is to setup several F-Curve modifiers. So one modifier will be responsible for the 1-st frame range, another one - for the second and so on.



You can copy / paste modifiers with buttons in the top part of the Modifiers tab in the Properties region of the Graph Editor. Once modifier was copied change its frame range to make it affect another part of animation.